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CS5490-ISZR Datasheet(PDF) 6 Page - Cirrus Logic |
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CS5490-ISZR Datasheet(HTML) 6 Page - Cirrus Logic |
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6 / 56 page  CS5490 6 DS982F2 2. PIN DESCRIPTION 2.1 Analog Pins The CS5490 has two differential inputs, one for voltage (VIN ) and one for currentIIN). The CS5490 also has two voltage reference pins (VREF ) between which a 0.1µ bypass capacitor must be placed. 2.1.1 Voltage Input The output of the line voltage resistive divider or transformer is connected to the VIN input of the CS5490. The voltage channel is equipped with a 10x, fixed-gain amplifier. The full-scale signal level that can be applied to the voltage channel is ±250 mV. If the input signal is a sine wave, the maximum RMS voltage is 250mVp / 2 176.78mVRMS, which is approximately 70.7% of maximum peak voltage. 2.1.2 Current Input The output of the current-sensing shunt resistor or transformer is connected to the IIN input pins of the CS5490. To accommodate different current-sensing elements, the current channel incorporates a programmable gain amplifier (PGA) with two selectable input gains, as described in the Config0 register description 6.6.1 Configuration 0 (Config0) – Page 0, Address 0 on page 31. There is a 10x gain setting and a 50x gain setting. The full-scale signal level for the current channel is ±50mV and ±250mV for 50x and 10x gain settings, respectively. If the input signal is a sine wave, the maximum RMS voltage is 35.35 mVRMS or 176.78mVRMS, which is approximately 70.7% of maximum peak voltage. Clock Generator Crystal In Crystal Out 2,1 XIN, XOUT — Connect to an external quartz crystal. Alternatively, an external clock can be supplied to the XIN pin to provide the system clock for the device. Control Pins and Serial Data I/O Digital Output 12 DO — Configurable digital output for energy pulses, interrupt, energy direction, and zero-crossings. Reset 3 RESET — An active-low Schmitt-trigger input used to reset the chip. Serial Interface 13,14 TX, RX — UART serial data output/input. Operating Mode Select 15 MODE — Connect to VDDA for proper operation. Analog Inputs/Outputs Voltage Input 6,7 VIN+, VIN- — Differential analog input for the voltage channel. Current Input 5,4 IIN+, IIN- — Differential analog input for the current channel. Voltage Reference Input 9,8 VREF+, VREF- — The voltage reference output and return. Power Supply Connections Internal Digital Supply 16 VDDD — Decoupling pin for the internal digital supply. Positive Analog Supply 11 VDDA — The positive analog supply. Analog Ground 10 GNDA — Analog ground. 1 7 6 5 4 3 2 8 16 10 11 12 13 14 15 9 XOUT VREF- VIN- VIN+ IIN+ IIN- RESET XIN VDDD VREF+ GNDA VDDA DO TX RX MODE |
Similar Part No. - CS5490-ISZR |
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Similar Description - CS5490-ISZR |
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